The sexes are generally very dissimilar in colour and markings, while in _Graucalus_ they are alike. The nidification and the form of the nests of the two genera are very similar. 105. Campephaga Jardinii, _Gould_ Vol. II. Pl. 60. 106. Campephaga Karu Vol. II. Pl. 61. 107. Campephaga leucomela, _Vig. & Horsf._ Vol. II. Pl. 62. 108. Campephaga humeralis, _Gould_ Vol. II. Pl. 63. Genus PACHYCEPHALA, _Swains._ The _Pachycephala gutturalis_ may be regarded as the type of this group of birds, which is peculiarly Australian, and comprises many species, universally distributed over the country. Their habits differ from those of most other insectivorous birds, particularly in their quiet mode of hopping about and traversing the branches of the trees in search of insects and their larvæ: caterpillars constitute a great portion of their food; but coleoptera and other insects are not rejected. The more gaily-attired species, such as _P. gutturalis_, _P. glaucura_, _P. melanura_ and _P. pectoralis_, resort to the flowering _Acaciæ_, _Eucalypti_ and other stately trees, while the more dull-coloured ones frequent the ground: they all build a neat, round, cup-shaped nest, and the eggs are generally four in number. Their powers of flight are not great: some of the species enjoy a wide range of habitat, while others are extremely local. The song of some is loud and rather pleasing, while others merely emit a whistling note, slowly but frequently repeated. 109. Pachycephala gutturalis Vol. II. Pl. 64. 110. Pachycephala glaucura, _Gould_ Vol. II. Pl. 65. 111. Pachycephala melanura, _Gould_ Vol. II. Pl. 66. 112. Pachycephala pectoralis Vol. II. Pl. 67. _Sylvia rufiventris_, Lath. Ind. Orn. Supp., p. liv. _Rufous-vented Warbler_, Lath. Gen. Syn. Supp., vol. ii. p. 248.—Shaw, Gen. Zool., vol. x. p. 696. _Turdus prasinus_, Lath. Gen. Hist. vol. v. p. 121? 113. Pachycephala falcata, _Gould_ Vol. II. Pl. 68. 114. Pachycephala Lanoïdes, _Gould_ Vol. II. Pl. 69. 115. Pachycephala rufogularis, _Gould_ Vol. II. Pl. 70. 116. Pachycephala Gilbertii, _Gould_ Vol. II. Pl. 71. _Pachycephala inornata_, Gould in Proc. of Zool. Soc., Part VIII. p. 164. Young? 117. Pachycephala simplex, _Gould_ Vol. II. Pl. 72. 118. Pachycephala olivacea, _Vig. & Horsf._ Vol. II. Pl. 73. The two birds described by me in the Proceedings of the Zoological Society, Part V. p. 164, as _P. xanthoprocta_ and _P. longirostris_, are both immature birds, and are, I believe, from Norfolk Island. Genus COLLURICINCLA, _Vig. & Horsf._